spark at all times. tested with bosch probe and show voltage through spark plug wires at all positions of throttle position when cranking --

each time throttle plates open it kills engine and I am assuming that injectors keep firing because the engine gets flooded --

As soon as the engine stops, injector pulses are cut off. A rich condition can be caused by the cold start valve sticking open, however, a rich condition will usually not cause an immediate engine stop with throttle opening, rather, there will some stumbling until the excess fuel is burned off. What is being described corresponds to a lean condition.

With the high fuel pressure (28-29psi is normal) mixture adjustments may have been set very lean (short pulse time).

What do the plugs tell you? Fuel soot (dry black), clean, or oily (wet, shiny black)?